# The LearningOnline Network with CAPA
# TeX Conversion Module
#
# $Id: lontexconvert.pm,v 1.48 2005/02/24 05:40:08 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# Copyright for TtHfunc and TtMfunc by Ian Hutchinson.
# TtHfunc and TtMfunc (the "Code") may be compiled and linked into
# binary executable programs or libraries distributed by the
# Michigan State University (the "Licensee"), but any binaries so
# distributed are hereby licensed only for use in the context
# of a program or computational system for which the Licensee is the
# primary author or distributor, and which performs substantial
# additional tasks beyond the translation of (La)TeX into HTML.
# The C source of the Code may not be distributed by the Licensee
# to any other parties under any circumstances.
#
package Apache::lontexconvert;
use strict;
use tth();
use vars qw($errorstring);
use Apache();
use Apache::lonmsg();
use Apache::lonxml();
use Apache::lonmenu();
use Apache::lonlocal;
# ====================================================================== Header
sub init_tth {
my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
if ($ENV{'browser.mathml'}) {
&tth::ttminit();
if ($ENV{'browser.unicode'}) {
&tth::ttmoptions('-L -u1 '.$options);
} else {
&tth::ttmoptions('-L -u0 '.$options);
}
} else {
&tth::tthinit();
if ($ENV{'browser.unicode'}) {
&tth::tthoptions('-L -u1 '.$options);
} else {
&tth::tthoptions('-L -u0 '.$options);
}
}
}
sub header {
$errorstring='';
my $time=time;
&init_tth();
return &Apache::lonxml::xmlbegin().
"\n
\n".
&Apache::lonxml::fontsettings().
&Apache::lonmenu::registerurl(undef,'tex').
"\n\n";
}
# ================================================================== Conversion
$Apache::lontexconvert::messedup=0;
# we need this routine because &converted can get called from inside
# of the safespace (through &xmlparse('stuff') which doesn't
# allow the opcode for alarm, so we need to compile this before we get
# into the safe space since opcode checks only occur at compile time
sub convert_real {
my ($texstring)=@_;
my ($xmlstring,$errorstring);
local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
local $SIG{ALRM}=sub {
&Apache::lonnet::logthis("ALRM");
$xmlstring='['.&mt("TeX unconverted due to errors").']';
$Apache::lontexconvert::messedup=1;
die &mt("TeX unconverted due to errors");
};
alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
if ($ENV{'browser.mathml'}) {
$xmlstring=&tth::ttm($$texstring);
$xmlstring=~s/\